Re: Turn off color management!
Re: Turn off color management!
- Subject: Re: Turn off color management!
- From: edmund ronald <email@hidden>
- Date: Wed, 09 Mar 2016 10:46:52 +0100
Graeme, Again, I would urge you to just look at the CUPS raster image
files, which yield ground truth quickly.
Not only is the print path horrible, but there are zillions of software
versions and bugs. For instance one version of Photoshop CS I had did not
apply the user's chosen color settings to the first print made in a
session; so if the first print you made was a target, your profile was
foobarred. I discovered it by ... looking at the raster file.
Edmund
ᐧ
On Wed, Mar 9, 2016 at 10:39 AM, Uli Zappe <email@hidden> wrote:
> Am 08.03.2016 um 23:48 schrieb Graeme Gill <email@hidden>:
>
> > The point of the null transform is to use the normal printing path, not
> one that attempts to turn off color management like the ColorSync or Adobe
> utility (if that's actually what they are doing.)
>
> No, ColorSync Utility at least does not do it this way. It makes sure that
> no color management takes place by turning *on* ColorSync. Because this
> means ColorSync has full control (*if* the printer driver is written
> according to Apple’s guidelines) and thus can prevent any color
> transformation from happening.
>
> You can easily verify this in the Print dialog in ColorSync Utility: If
> you set the Color: popup in the ColorSync Utility pane to one of its three
> values and then go to the Color Matching pane, you will find the ColorSync
> – <No ColorSync> radio buttons updated accordingly, so you’ll see what each
> of the ColorSync Utility > Colors: values does.
>
> Which is:
>
> Prematch to printer profile: ColorSync is ON
> Hand off to printer: ColorSync is OFF
> Print as color target: ColorSync is ON
>
> BTW, "Hand off to printer" means exactly that. It does *not* mean "No
> Color Management at all" – as is it is often paraphrased outside the
> context of ColorSync Utility –, but "Let the printer driver do with colors
> whatever it wants to do (which might be nothing, or might be some fancy
> color processing, depending on the specific driver and the user settings it
> offers in the vendor specific panes of the Print dialog).
>
> *But* according to Apple’s guidelines, the printer driver *must not*
> perform *any* color processing on its own as soon as ColorSync is turned
> *on* in the Print dialog > Color Matching pane. It seems that the old Canon
> printer drivers ignored this.
>
>
> Bye
> Uli
> _________________________________________________________________________
>
> Uli Zappe, Christian-Morgenstern-Straße 16, D-65201 Wiesbaden, Germany
> http://www.ritual.org
> Fon: +49-700-ULIZAPPE
> Fax: +49-700-ZAPPEFAX
> _________________________________________________________________________
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